Question

question 7 of 10
what kind of bonds are hydrogen bonds?

a. an intramolecular covalent bond in the h₂ molecule

b. polar covalent bonds that form between hydrogen and another atom

c. strong polar attractions between molecules involving h, f, o, and n

d. any bond between hydrogen and a highly electronegative atom

Explanation:

• Option A: Intramolecular covalent bonds in \(H_2\) are just covalent bonds within the molecule, not hydrogen bonds. Hydrogen bonds are intermolecular, so A is wrong.
• Option B: Polar covalent bonds between H and another atom (like in H - O in water) are intramolecular covalent bonds, not hydrogen bonds. Hydrogen bonds are intermolecular attractions, so B is wrong.
• Option C: Hydrogen bonds are strong polar attractions between molecules. They occur when H is bonded to highly electronegative atoms (F, O, N) in one molecule and interacts with F, O, or N in another molecule. This matches the definition of hydrogen bonds.
• Option D: A bond between H and a highly electronegative atom is a polar covalent bond (intramolecular), not a hydrogen bond. Hydrogen bonds are intermolecular attractions, so D is wrong.

Answer:

C. Strong polar attractions between molecules involving H, F, O, and N